Horn: Description and Operation

Horns System Description and Operation

System Description

The horn system consists of the following components:

* The HORN fuse
* The Horn PCB relay
* The Horn switch contacts
* The Horn assembly
* Body control module (BCM)

System Operation

* The vehicle horns are activated whenever the horn switch is depressed.
* The BCM commands the horns ON under any of the following conditions:

- When the panic button is depressed on the remote control door lock transmitter. For further information refer to Keyless Entry System Description and Operation (with Accessory 2 Way Remote) (Keyless Entry System (with Accessory 2 Way Remote))Keyless Entry System Description and Operation (without Accessory 2 Way Remote) (Keyless Entry System (without Accessory 2 Way Remote)).
- When the content theft deterrent system detects a vehicle intrusion. For further information refer to Content Theft Deterrent (CTD) Description and Operation (Content Theft Deterrent (CTD)).
- When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information refer to Keyless Entry System Description and Operation (with Accessory 2 Way Remote) (Keyless Entry System (with Accessory 2 Way Remote))Keyless Entry System Description and Operation (without Accessory 2 Way Remote) (Keyless Entry System (without Accessory 2 Way Remote)).

Circuit Operation

Battery positive voltage is applied at all times to the horn relay coil and the horn relay switch. Pressing the horn switch applies ground to the horn relay control circuit. When the horn relay control circuit is grounded, the horn relay is energized and battery positive voltage is applied to the horns through the horn control circuit. The horns sound as long as ground is applied to the horn relay control circuit.